Which of the following is not a necessary apparatus for the measurement of acceleration due to gravity $(g)$ by a simple pendulum?

Stop watch

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Screw gauge

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Spherometer

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Scale

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Solution

The correct option is D Spherometer
In simple pendulum experiment, we require a stopwatch to measure the time taken for a certain number of oscillations, screw gauge to measure the diameter of the bob and scale to measure the length of the string. There is no need of Spherometer.
Hence, Option C is correct.

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